DNS

DNS analysis

Third-Party Tools

Use these first, as it is completely passive and uses Internet infrastructure instead of your own machine.

• DNS Dumpster [https://dnsdumpster.com/]

• Shodan [https://www.shodan.io/]

• Censys [https://censys.io/]

Dig

Powerful linux based tool used to gather and analyze dns records

Gather All Records for a Domain

This command uses 192.168.1.1 to gather information

dig @192.168.1.1 sec542.org -t any
dig @192.168.1.1 sec560.org +norecursive    # Turns off recursion
dig @192.168.1.1 sec560.org +recursive      # Turns on recursion

Simplified PTR Lookups

Using the -x flag is the same as dig 23.1.168.192.in-addr-arpa PTR

dig -x 192.168.1.23

Attempt Full Zone Transfer

Very unlikely to work, most domains should not allow external zone transfers. More likely to happen from the inside though. Always attempt this anyway!

dig @<network dns server> m4lwhere.org -t axfr
dig @<network dns server> AXFR m4lwhere.org

nslookup

We can use nslookup from a windows host to try and gather information as well.

C:\Users\m4lwhere> nslookup
> server 10.0.0.1
> set type=AXFR
> ls -d goblins.local

DNSrecon

Multi-threaded DNS tool written in python 3

dnsrecon -d m4lwhere.org -n 8.8.8.8

DNS Brute Forcing

Attempt to enumerate DNS hostnames by guessing subdomains.

Gobuster

Uses gobuster for DNS subdomain, is multi-threaded 😎

gobuster dns -d m4lwhere.org -w /usr/share/wordlists/dirbuster/directory-list-lowercase-2.3-small.txt

Nmap Script

Lots of switches for this command

nmap --script dns-brute --script-args dns-brute.domain=foo.com,dns-brute.threads=6,dns-brute.hostlist=./hostfile.txt,newtargets -sS -p 80